Frame rate adjusting method and apparatus for displaying video on interlace display devices
a display device and frame rate adjustment technology, applied in the direction of picture reproducers using projection devices, signal generators with optical-mechanical scanning, television systems, etc., can solve the problem of not being able to properly display an ntsc-formatted dvd title on a pal display system
Inactive Publication Date: 2007-01-04
NOVATEK MICROELECTRONICS CORP
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Benefits of technology
The present invention provides an apparatus and method for displaying video images on a display system with a different scan rate. The apparatus includes a decoder for converting video images into continuous fields, a system identifier for sending a second signal indicating the second scan rate, a controller for determining interrupt points for the continuous fields, a reorganizing unit for reorganizing sections of the continuous fields, and a multiplexing circuit for selecting the reorganized sections of fields and the other sections of fields to provide a second sequence with the second scan rate. The technical effect of the invention is to enable smooth display of video images on a display system with different scan rates.
Problems solved by technology
Due to the difference in vertical refresh rate between the NTSC and PAL systems, one is not able to properly display an NTSC-formatted DVD title on a PAL display system.
Method used
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[0026]FIG. 1A is a schematic circuit block diagram of a video display apparatus 10 in accordance with one embodiment of the present invention. Referring to FIG. 1A, video display apparatus 10 includes a digital versatile disc (“DVD”) drive 11, a video decoder 12, a frame buffer 13, a field reorganizing unit 14, a determining unit 15, a controller 16, a multiplexing circuit 17, a television (“TV”) encoder 18, and a system identifier 19. In operation, DVD drive 11 reads the contents of a disc 30 and sends the contents to video decoder 12. Video decoder 12, connected to DVD drive 11, decodes the contents of disc 30 into decoded frames, and determines format information including, for example, the picture format and field scan rate, contained in the decoded frames. The decoded frames include continuous fields arranged in sequence. Specifically, the continuous fields include top and bottom field pictures interleaved with each other. Video decoder 12 on one hand sends the decoded frames t...
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An apparatus for displaying a video image on a display system comprises a decoder for converting the video image into continuous fields arranged in a first sequence, the continuous fields having a first scan rate different from a second scan rate of the display system, and sending a first signal indicating the first scan rate, a system identifier for sending a second signal indicating the second scan rate, a controller in response to the first signal and the second signal for determining interrupt points for the continuous fields, the interrupt points dividing the continuous fields into odd-numbered sections of fields and even-numbered sections of fields, a buffer for storing the continuous fields, a reorganizing unit for reorganizing one of the odd-numbered or even-numbered sections of fields into reorganized sections of fields, and a multiplexing circuit for selecting the reorganized sections of fields from the reorganizing unit, and selecting the other of the odd-numbered or even-numbered sections of fields from the buffer to provide a second sequence having the second scan rate.
Description
BACKGROUND OF THE INVENTION [0001] The present invention relates generally to a method and apparatus for digital video processing and, more particularly, to a method and apparatus for adjusting an original field sequence for display on a target display system having a vertical refresh rate inconsistent with the original field sequence. [0002] A digital versatile disc (“DVD”) video program is generally encoded in one of the following three frame formats having different resolutions and scan rates. The first frame format, having a resolution of 720×480 and a scan rate at 29.97 frames per second, is suitable for use in the National Television Standards Committee (“NTSC”) color television system provided for North America and Japan. The second frame format, having a resolution of 720×480 and a scan rate at 23.976 frames per second, is generally used to encode film movies. The third frame format, having a resolution of 720×576 and a scan rate at 25 frames per second, is suitable for use ...
Claims
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IPC IPC(8): H04N7/01
CPCH04N7/0112H04N7/106H04N7/0127
Inventor HSU, RONG-FU
Owner NOVATEK MICROELECTRONICS CORP